SERV ICE IN STRUC TION M20- 34B
IS SUE DATE: 9 JANU ARY, 1976
SUB JECT:2 RE LAY MODI FI CA TION KIT
MOD ELS/S/N
AF FECTED:M20C, S/N 20- 0010, 20- 1147 THRU 20- 1185
M20E, S/N 21- 0038, 21- 1161 THRU 21- 1180
M20F, S/N 22- 1179 THRU 22- 1291, 22- 1293 THRU 22- 1305
TIME OF COM PLI ANCE:AT OWN ERS OP TION (AS MAIN TE NANCE OR RE LAY
RE PLACE MENT DIC TATES)
IN TRO DUC TION:
THE ORIGI NAL RE LAY IS NO LONGER AVAIL ABLE FOR SPARES RE PLACE MENT SINCE
ORIGI NAL MANU FAC TURE OF AIR CRAFT. THIS SERV ICE IN STRUC TION IS TO DOCU MENT
RET RO FIT PRO CE DURES FOR RE PLACE MENT OF ORIGI NAL RE LAY WITH THE CUR RENT
IM PROVED TWO (2) RE LAY SYS TEM.
IN STRUC TIONS:
1. Place air craft on jacks and re move the fol low ing:
a. Large ac cess plate on belly.
b. Left and right ac cess pan els for ward of wind shield.
c. Mani fold/fuel pres sure gauge.
d. Pi lot’s seat and left car pet.
2. Ref er ence Sche matic Fig ure SI M20- 34B-1; cut the fol low ing wires at points in di cated be low. Ref er -
ence Fig ure SI M20- 34B-2 (Item 2) for physi cal area for wires to be cut.
a. 21EG08A16 @ [1]
b. 21EG18A16 @ [2]
c. 21EG19A16 @ [3]
d. ** 1-20 @ [4]
e. 21EG11A16 @ [5]
f. **RED @ [9]
g. **GREEN @ [10]
h. **YEL LOW @ [11]
i. **BLACK @ [12]
j. **2-20 @ [13]
3. Ref er ence Fig ure SI M20- 34B-1, [14], re move re lay 21EG05A with at tached wire ends and at tac h ing hare -
ware . Ref er ence Fig ure SI M20- 34B-2 for lo ca tion of sin gle re lay 21EG05A and hard ware to be r e moved.
4. Ref er ence Fig ure SI M20- 34B-3:
a. Cap wires 21EG28A16, 21EG09A16 and **3-20 us ing AMP cap #324485 at [10].
b. Con nect wires 21EG08A16 and 21EG19A16 with AMP win dow splice #320559 at [1]. This con -
nects pins 1 and 4 of re cep ta cle 21RC03A.
c. Con nect wire **1-20 (from pin 3 of re cep ta cle 21RC03A) to wire 21EG18A16 (from C1 of switch
21EG03A) with AMP win dow splice #320559 at [2].
d. Con nect wire 21EG11A16 (from pin 2 of re cep ta cle 21RC03A) to wire **1-20 (from 1 of switch
21EG07A) with AMP win dow splice #320559 at [3].
e. In stall re lay/bracket as sem bly, (re lays 21EG05E and 21EG08E) (shown in Fig ure SI M20- 34B-3
with at tached wires [9]. Po si tion new re lays/brack ets as sem bly on floor board at ap proxi mate lo ca tion
of old sin gle re lay (ref er ence Fig ure SI M20- 34B-2). In stall brack ets to floor board with 4 riv ets as shown
in Fig ure SI M20- 34B-4. Re lays may be re moved from brack ets for riv et ing if de sired. Ver ify new re lays
are clear of any com po nents. Route wires 21EG21C12 and 21EG20C12 [8] along main wire har ness up
to cock pit cir cuit breaker 21EG01A. Con nect to same screw ter mi nal as wire 21EG01A16. Ground w ire
21EG29E12, as shown in Fig ure SIM20- 34B-3.
f. Com bine wires **BLACK and **GREEN in AMP knife dis con nect #32448 and hook to wire
21EG33E12 at [6].
g. Com bine wires **RED and **YEL LOW in AMP knife dis con nect #32448 and hook to wire
21EG37E12 at [7].
h. Place AMP knife di socnnect #32448 on wire 21EG08A16 (from NC1 of switch 21EG03A) and
hook to wire 21EG38E16 at [4].
i. Place AMP knife dis con nect #32446 on wire **2-20 and hook to wire 21EG40E16 at [5].
5. Re move wire 21EG14A16 from ter mi nal 5 of Land ing Gear con trol switch mounted in in stru men t panel.
Re move ter mi nal from wire and cap with AMP #324485 cap. Gain ac cess through in stru ment hole im me -
di ately be low Land ing Gear Switch.
6. Check land ing gear rig ging in ac cor dance with ap pro pri ate Moo ney Serv ice and Main te na nce Man ual,
1975 is sue.
7. Make the fol low ing Log Book en try:
Com plied with Serv ice In struc tion M20- 34 which modi fied land ing gear elec tri cal sys tem in ac cor dance
with Moo ney draw ing SCI- 800269L-2 [E]; ref er ence 1975 Serv ice and Main te nance Man ual.
WAR RANTY:N/A
REF ER ENCE
DATA:
PARTS LIST:SERV ICE IN STRUC TION KIT - SI M20- 34B
ITEM.PART NUM BER...DE SCRIP TION........QTY
1..# 324485....CAP, WIRE (AMP)........4
2..#320559....SPLICE, WIN DOW(AMP)......3
3..#32446....DIS CON NECT, KNIFE (AMP).....1
4..#32448....DIS CON NECT, KNIFE (AMP).....3
5 RE LAY , BRACKET & WIR ING AS SEM BLY (14 VOLT).......1
CON SIST ING OF THE FOL LOW ING COM PO NENTS
...26.72.23....RE LAY (14 VOLT)........2
...800375-1....BRACKET.........2
...AN3- 5A....BOLT..........4
...AN363- 1032...NUT...........4
...AN960- 10L....WASHER..........8
..21EG41E16...WIRE..........1
...21EG40E16...WIRE..........1
...21EG39E16...WIRE..........1
...21EG38E16...WIRE..........1
...21EG37E12...WIRE..........1
...21EG35E12...WIRE..........1
...21EG33E12...WIRE..........1
...21EG31E12...WIRE..........1
...21EG29E12...WIRE..........1
...21EG27E12...WIRE..........1
...21EG24E12...WIRE..........1
...21EG22E12...WIRE..........1
6..MS20470AD3...RIVET..........4
7..21EG21C12...WIRE..........1
8..21EG20C12...WIRE..........1
FIG URES/
TA BLES:See Fig ures on fol low ing pages.
PAGE 2SERVICE INSTRUCTION M20-34B
DATED: 9 SEPTEMBER, 1976
SERVICE INSTRUCTION M20-34BPAGE 3
DATED: 9 SEPTEMBER, 1976
PAGE 4SERVICE INSTRUCTION M20-34B
DATED: 9 SEPTEMBER, 1976
SERVICE INSTRUCTION M20-34BPAGE 5
DATED: 9 SEPTEMBER, 1976
PAGE 6SERVICE INSTRUCTION M20-34B
DATED: 9 SEPTEMBER, 1976
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